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Stellarium: sensor frame rotated 90 degrees

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#1 maxsid

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Posted 02 April 2020 - 12:12 AM

Hello,

This is true for all sensors configured in my instance of Stellarium (currently 0.20.0.1 Windows 64b). Tried a fresh install on a different PC with default sensors - same story.

Either I got confused somewhere or missing something or it's a bug or a feature.

 

If a sensor is configured like so (default):

Resolution X: long  side e.g. 6000 pixels

Resolution Y: short side e.g. 4000 pixels

Chip width  : long  side e.g. 24 mm

Chip height : short side e.g. 16 mm

Then the sensor frame shown in Stellarium is rotated by -90 degrees with respect to what I actually get on my camera.

 

So, I have to tell Stellarium to rotate the sensor by -90 degrees or configure the sensor like so:

Resolution X: short side e.g. 4000 pixels

Resolution Y: long  side e.g. 6000 pixels

Chip width  : short side e.g. 16 mm

Chip height : long  side e.g. 24 mm

 

Stellarium default:

stellarium-norot-sm.JPG

 

Actual image:

camera-sm.JPG

 

Stellarium rotated (matches the actual image):

stellarium-sm.JPG

 

Is this just me?

Thanks!

 

Image: modded Nikon D5500 with IDAS LPS-D1 filter. Tamron 28-75mm f/2.8 @ 75 mm. Rosette and Christmas Tree/Cone.


Edited by maxsid, 02 April 2020 - 12:30 AM.


#2 Alexander Wolf

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Posted 02 April 2020 - 03:04 AM

It's may be strange, but what about physical orientation of camera on mount?



#3 maxsid

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Posted 02 April 2020 - 03:09 AM

Of course, camera is not rotated. And this applies to DSLR and to CCD too.


Edited by maxsid, 02 April 2020 - 03:31 AM.


#4 Alexander Wolf

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Posted 02 April 2020 - 05:29 AM

Are you use azimuthal mount for camera?



#5 maxsid

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Posted 02 April 2020 - 04:03 PM

Equatorial



#6 NGC 2419

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Posted 02 April 2020 - 04:18 PM

...
Is this just me?
Thanks!
...

No. I noticed this some time ago and thought maybe I was doing something wrong. I just rotate everything 90° and call it good.

Now if you want to see that sensor frame do some really weird stuff, try framing Polaris.

Clear skies!

Edit to add that I know why the Polaris thing happens, it just caught me off guard the first time I saw it.

Edited by NGC 2419, 02 April 2020 - 04:40 PM.


#7 maxsid

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Posted 02 April 2020 - 04:39 PM

Ah.. OK. It's a "feature" then...

Polaris is a different story though. It's like using a compass close to the north pole.. Any direction will be south.

Thanks!



#8 Domer

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Posted 20 August 2020 - 01:22 PM

I had a discussion with some folks on the Stellarium forum about this.  It turns out that Stellarium is modelling open fork or horseshoe equatorial mounts, not German Equatorial Mounts (GEMs).  A feature request was submitted to get that added.



#9 Domer

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Posted 20 August 2020 - 06:49 PM

Update - the folks who maintain Stellarium refuse to see this as a bug and will not fix it.  Perhaps if more people chime in on that thread I referenced in the post above, they might open their minds.



#10 Alexander Wolf

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Posted 20 August 2020 - 07:57 PM

Update - the folks who maintain Stellarium refuse to see this as a bug and will not fix it.  Perhaps if more people chime in on that thread I referenced in the post above, they might open their minds.

Other way also: anybody may prepare patches and propose that to merge in the planetarium.

 

P.S. This request not in my short TODO list and probably patches from community will be better and faster solution.



#11 gzotti

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Posted 21 August 2020 - 01:47 PM

When your camera has its longer edge oriented parallel to the declination arcs, you should rotate it 90°. Or rotate the displayed sensor frame 90° to match your camera. Simple as that. There is nothing else to fix.



#12 Domer

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Posted 25 August 2020 - 02:36 PM

When your camera has its longer edge oriented parallel to the declination arcs, you should rotate it 90°. Or rotate the displayed sensor frame 90° to match your camera. Simple as that. There is nothing else to fix.

I don't like rotating the camera physically on the mount because that moves the center of gravity slightly off-axis which can make balancing a bit more difficult.  If all the mass of the payload isn't in a single plane, then a balanced rig on one side of the mount won't be balanced when rotated to the other side of the mount.  I prefer to avoid that situation when I can.

 

So I guess I'll just keep rotating the FOV by 90 degrees every time I use the Oculars tool - not ideal, but it works.

 

BTW - Stellarium is an awesome program!



#13 lakeorion

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Posted 30 August 2020 - 09:54 AM

I thought it was me that was off-kilter.  So I took the camera / scope combination and mounted it on a bucket.  Then I took pictures of a car bumper across the street.  No rotation.  FWIW SGP is the same way.  I just put the 90 rotation into my sequence and get on with it.




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